Emerson Process Management IM-106-340 Alarms O2 Temp Hi, Fault 9, High Heater Temp

Instruction Manual

IM-106-340, Rev. 4.0

May 2006

Figure 8-11. Fault 9, High Heater Temp

	HEATER T/C
DIAGNOSTIC	HEATER	SW2
ALARMS	O2 CELL	ON
	CALIBRATION

CALIBRATION RECOMMENDED

Oxymitter 4000

Fault 9, High Heater Temp

Figure 8-11shows the electronic assembly for an Oxymitter 4000 with a membrane keypad (upper view) and an Oxymitter 4000 with an LOI (lower view).

Membrane Keypad

When Fault 9 is detected, the HEATER LED flashes five times, pauses for three seconds, and repeats.

TEST

POINTS

INC INC

HIGH LOW GAS GAS

DEC DEC

O2 CELL mV +

O2 CELL mv - HEATER T/C + HEATER T/C -

CAL

TEST GAS + PROCESS - % O2

TP1 TP2 TP3 TP4

TP5

TP6

J1 RED YEL GRN ORG

1.	If the thermocouple produces a voltage in
	excess of approximately 30.7 mV, the high
	heater temp alarm activates.
2.	The 4-20 mA signal returns to the default
	value (4 or 20 mA).
3.	This alarm is self-clearing. When
	temperature control is restored and the
	thermocouple voltage returns to the normal
	range, the alarm clears.
4.	If the temperature continues to rise, the
	next alarm will be the High High Heater

KEYPAD

Alarms

O2 Temp Hi

LOI 37260027

Temp alarm.

LOI

When Fault 9 is detected, the LOI displays the "O2 Temp Hi" message. Refer to the comments and procedures in paragraphs 1 through 4 above.

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